Cold chisel



W. 5. THOMSON cow 011 1521.

Jan. 26,1926. 1,510,650-

Filed Oct. 18. 1923 Patented Jan. 26, 1926.

UNITED STATES PATENT OFFICE.

WILLIAM STRATTON THOMSON,- OF PLANTSVILLE, CONNECTICUT, ASSIGNOB TO THETOIBRIN TOOL COMPANY, OF PLANTSVILLEY CONNECTICUT, A CORPORATION.

GOLD c'n'rs'n'n Application filed October 18, 1923. Serial No. 669,413.

To all whom it may concern:

Be it known that I, WVILLIAM'S. THOMSON, a citizen of the United States,residing at Plantsville, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements in ColdChisels, of which the following is a specification.

My invention relates to improvements in cold chisels, of the form thatis forged from stock in the form of a bar of material of circular formof cross-section and comprises an elongated blade of wedge-shape thatmerges with a handle having a polygonal form of cross-section, and theobject of my improvement is to produce a form of structure in which theblade is nicely finished and polished from end to end and the handle isin the rough 'and wherein the finishing operations on the blade may beperformed substantially without any liability of encroaching upon theexposed faces of the handle, particularly at the junction of the bladeand handle, where they merge, the result being attained by reason of asuitable reduction in the size or diameter of the cross section of thehandle relatively tothe portion of the blade at or adjacent saidjunction.

In the accompanying drawing:-

Figure 1 is a side elevation of a cold chisel embodying my invention.

Figure 2 is a plan view of the same.

Figure 3 is an end elevation of the same as viewed from the butt.

Figure 4 is an end elevation as viewed from the bit.

My improved cold chisel comprises an elongated handle that terminates atthe rear end 11 in the form of a butt of conical form and at the frontend merges with the blade 12, the latter terminating in the form of thecutting edge or bit 13.

The body portion of the handle 10 is of octagonal form of cross-section.

The blade 12 is Wedge-shaped as defined by the inclined top and bottomfaces 14.

As to width the blade 12 is, as shown, of uniform width from end to end,as defined by the faces 15. As to further details for the blade 12, theouter end portion, adjacent the bit 13, isof rectangular form ofcrosssection, and is designatedby the character 16. As the blade 12extends inwardly from the outer portion 16 and increases in thick nessthere appear triangular corner faces 18 and the rear portion 17 is ofoctagonal form, being bound by said corner faces 18 intermediate the topand bottom fiat faces 14 and the adjacent side faces in each case, or ateach corner. At the large end, at the junction 19 of the blade 12 andthe handle 10, the octagonal form of cross-section mentioned issubstantially equi-lateral.

The tool is straight, the handle 10 and blade 12 being extended along acommon straight axis. I

The invention resides in the particular structure that is provided atand adjacent the junction 19 of the blade 12 and the handle 10, wherebythe faces mentioned provided on the blade can be freely operated uponfor polishing and finishing in any manner desired, having in mind theusual operations for effecting this result, as by the use of grindingand polishing wheels and belts.

The expedient utilized for effecting the result mentioned comprises areduction in size of the portion of the handle adjacent and merging withthe blade at the junction 19. Such reduction could in some instances bemade local, with the body portion of the handle of what may bedesignated full size.

In the present instance, as shown, the handle 10 is made of uniformsize, the crosssect-ion being slightly though appreciably smaller thanthat at the rear end or what may be designated as the butt-end of theblade 12, and denoted by the character 19 at the junction as has beendescribed. Thus just at the rear of the junction line 19 there is aninclined wall structure 21 that bounds the material that fills in thecorners between the individual faces 22 of the octagonal handle 10 andthe adjacent and opposed edges of the faces 14, 18, and 15 that definethe adjacent relatively large butt end portion or rear end portion 23 ofthe blade 12.

The structure described provides positive clearance space betweenextensions of any and all of the faces that bound the blade andthe facesthat bound the handle.

I claim as my invention 1. A cold chisel having a handle and a blademerged one with the other, said handle being in the rough, said bladebeing finished on all sides and faces, and the portion of said bladeat-the junction with the handle being larger, on all sides than thehandle in the diame ral d me sions, Where by the finishing of the bladeis facilitated Without encroachment upon the handle.

2. A cold chisel comprising a blade of tapered form and a handleprojected from end of said blade, and said handle being in the form of astructure that is reduced on all sides relatively to the part of theblade to which it is connected.

8. A cold chisel comprising in a one piece structure a blade of taperedform that is merged by its large end with a handle body, said large endand said handle body being each of octagonal form of cross-section, andsaid handle body being of reduced diametral dimensions relatively tosaid large end.

WILLIAM STRATTON THOMSON.

